any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
造句
He has drawn some lake-green duckweeds, which look quite natural. 他畫了一些湖綠色的浮萍，看起來很自然。
Plants like duckweeds float on the surface of still and slowmoving waters, while those with roots and flexible stems can stand in swiftflowing streams. 從漂浮在靜止或者緩慢流動的水面上的浮萍，到位于激之流中的長著根和柔軟莖的植物。